CN104980368A - Bandwidth guarantee method and apparatus in software defined network (SDN) - Google Patents
Bandwidth guarantee method and apparatus in software defined network (SDN) Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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Abstract
The invention provides a bandwidth guarantee method and apparatus in a software defined network (SDN). The method comprises that a controller in the SDN obtains a network topology structure of the SDN; the controller obtains a link bandwidth which directly connects every two forwarding apparatuses in the SDN according to the network topology structure; and the controller reserves a link bandwidth for user equipment according to the obtained link bandwidth which directly connects every two forwarding apparatuses. The invention can provide bandwidth guarantee for users in the SDN.
Description
Technical field
The present invention relates to software defined network (SDN, Software Defined Network) technical field, particularly relate to the bandwidth safeguard method in SDN and device.
Background technology
The maximum difference of SDN and legacy network, that control plane and forwarded planar separation are come, forwarded plane will have controlling functions no longer, and control plane is given the operating system outside independent of Forwarding plane, characteristic then customizes based on operating system.
OpenFlow(open flows) be define in SDN framework one communication interface standard between controller and forwarding.OpenFlow allows the Forwarding plane of directly access and operational network equipment, and these network equipments may be physically, also may be virtual.OpenFlow agreement is always in sustainable development.
The thought of OpenFlow is separated control plane and datum plane, uses the protocol communication of standard therebetween; Datum plane adopts the mode based on stream to forward.
As shown in Figure 1, OpenFlow network is by by OpenFlow Channel(passage) the OpenFlow Switch(switch that connects) and OpenFlow Controller(controller) form.
OpenFlow controller is control centre, is sent to OpenFlow switch according to the configuration of user or the protocol generation stream table of dynamic operation.Possibility running experiment program on controller, or the software of third party's exploitation etc.OpenFlow switch receives the stream table that OpenFlow controller is arranged, and carries out Message processing according to stream table, to the state of this switch of OpenFlow controller report and event as interface Up/Down.Communicated by OpenFlow passage (based on TCP or SSL) between OpenFlow switch and controller.
Because OpenFlow can programme to network based on stream, therefore can provide the control of quite meticulous dynamics based on the SDN framework of OpenFlow, realize the real-time response that network changes on application, user and session-level.And current IP-based routing mode is the control that can not provide in this rank.
OpenFlow forwarding process is as follows: message is tabled look-up after entering OpenFlow switch from the stream table that sequence number is minimum, the inquiry of multiple stream table can be carried out, once after certain stream table matches, the behavior aggregate (Action Set) of this message can be upgraded, the set of behavior aggregate and action, be initially sky, the operation of message is all placed in this set.After completing the process of last stream table, the everything in behavior aggregate can be performed, and now the content of message can be modified, and then forwards from appointment outgoing interface.
OpenFlow is mated by user-defined stream table and is processed message.All stream list items are all organized in different Flow Table, in same Flow Table, carry out priority coupling by the priority of stream list item.An OpenFlow switch can comprise one or more Flow Table.
When Controller issues stream table, protocol massages structure as shown in Figure 2, wherein:
Match Fields: matching field, for matching message;
Priority: priority, the first coupling that during coupling stream list item, priority is high;
Counters: counter, upgrades during matching message;
Instructions: instruction, change behavior aggregate or line treatment;
Timeouts: time-out time, the maximum time that stream list item is preserved in this switch or standby time;
Cookie: the mark that controller uses, may be used for controller filtering packets statistics, stream changes, stream is deleted.
Define multiple matched rule in agreement, comprise object MAC(Media Access Control, medium education) address, source MAC, object IP(Internet Protocol, Internet Protocol) address, source IP address etc.These matched rules all supported by platform, and product customizes according to self-ability.Exact matching and inexact matching is divided into during message coupling.
In OpenFlow network, current flux forwards and uses Amy-OSPF(Open ShortestPath First, ospf) Routing Protocol, flow is had to enter after in OpenFlow network, first packet reports controller, then equipment is issued after controller calculating path, the forwarding of coaching device.
Current implementation method has irrational place.First, after Amy-OSPF Routing Protocol calculates the path of flow, instruct after being issued to equipment and forward, the size of following the tracks of these flows can't be continued, once there is the scope of unexpected increase beyond bandwidth in flow, some traffic loss can be caused, in addition in the data in the heart, the flow of main server can not provide Bandwidth guaranteed to special user when flow is uprushed, the phenomenon occurring that a large amount of packet losses reconnects can be caused, whole network can be made to double to worsen, and the network greatly affecting user is experienced.
Summary of the invention
The invention provides the bandwidth safeguard method in SDN and device, to provide bandwidth safeguard to the responsible consumer in SDN.
Technical scheme of the present invention is achieved in that
A bandwidth safeguard method in software defined network SDN, the method comprises:
Controller in SDN obtains the network topology structure of SDN;
Described controller, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit in SDN;
Described controller according to obtain direct-connected link bandwidth between two between forwarding unit, for link bandwidth reserved by subscriber equipment.
The network topology structure that controller in described SDN obtains SDN comprises:
The Packet-in message being packaged with the message that local subscriber apparatus sends that controller is sent according to forwarding unit, learns the network topology structure between forwarding unit and local subscriber apparatus;
Controller outwards sends Packet-out message from all SDN protocol ports of self, and the data of carrying in this message are for presetting message, and action is: broadcast to all of the port, when controller receives from the arbitrary SDN protocol port of self the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit receives described Packet-out message, default message is parsed from this message, action according in this message: broadcast to all of the port, this default message is broadcasted away from all of the port of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, the SDN protocol port of this Packet-in message from self is sent.
The network topology structure that controller in described SDN obtains SDN comprises:
The Packet-in message being packaged with the message that local subscriber apparatus sends that controller is sent according to forwarding unit, learns the network topology structure between forwarding unit and local subscriber apparatus;
Controller receives from the arbitrary SDN protocol port of self the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit presets message to all of the port broadcast of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, encapsulate this default message in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
Described controller, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit and comprises:
Described controller obtains the bandwidth of its each port to each forwarding unit in SDN, according to described network topology structure, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
Described controller, according to the direct-connected link bandwidth between two between forwarding unit obtained, is reserved link bandwidth for subscriber equipment and is comprised:
Controller confirms to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value, then according to the network topology structure of the SDN obtained, calculate all paths of first user equipment to the second subscriber equipment, one or more path is selected in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path, and for selected path, issue stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on path.
Described one or more path of selecting in the path calculated is:
In the path calculated, according to path cost from small to large, the short path that the path minimum from expense or expense are time little, the path that can meet the bandwidth of the first numerical value is selected.
Described method comprises further:
When controller receive that arbitrary forwarding unit sends carry the Packet-in message of dynamic host configuration protocol DHCP request message time, DHCP request message is parsed from this message, for the transmission user equipment allocation IP address of this DHCP request message, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and returns to described transmission subscriber equipment;
And the first user equipment in described stream list item and the second subscriber equipment are with IP address designation.
Described method comprises further:
What controller received that arbitrary forwarding unit sends carries the Packet-in message that user equipment (UE) IP address reports message, parses this user equipment (UE) IP address and reports message, obtain the IP address of the local subscriber apparatus of this forwarding unit from this message from this message;
And the first user equipment in described stream list item and the second subscriber equipment are with IP address designation.
A bandwidth safeguard device in software defined network SDN, this device is arranged on the controller of SDN, and this device comprises:
First module: the network topology structure obtaining SDN;
Second module: according to the network topology structure of SDN, obtains direct-connected link bandwidth between two between forwarding unit in SDN;
3rd module: according to the link bandwidth between two between forwarding unit direct-connected in SDN, for link bandwidth reserved by important subscriber equipment.
The network topology structure that described first module obtains SDN comprises:
According to the Packet-in message being packaged with the message that subscriber equipment sends that forwarding unit is sent, learn the network topology structure between forwarding unit and subscriber equipment;
Outwards send Packet-out message from all SDN protocol ports of this controller, the data of carrying in this message are for presetting message, and action is: broadcast to all of the port, when receiving the Packet-in message that arbitrary forwarding unit is sent from arbitrary SDN protocol port of this controller, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit receives described Packet-out message, from this message, parse default message, the action according in this message: to all of the port broadcast, broadcasted away by all of the port of this message from self; Arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
The network topology structure that described first module obtains SDN comprises:
According to the Packet-in message being packaged with the message that subscriber equipment sends that forwarding unit is sent, learn the network topology structure between forwarding unit and subscriber equipment;
The Packet-in message that arbitrary forwarding unit sends is received from arbitrary SDN protocol port of this controller, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit presets message to all of the port broadcast of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, encapsulate this default message in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
Described second module, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit and comprises:
The bandwidth of its each port is obtained to each forwarding unit in SDN, according to the network topology structure of SDN, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
Described 3rd module, according to the direct-connected link bandwidth between two between forwarding unit obtained, is reserved link bandwidth for subscriber equipment and is comprised:
Confirm to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value, then according to the network topology structure of the SDN obtained, calculate all paths of first user equipment to the second subscriber equipment, one or more path is selected in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path, and for selected path, issue stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on path.
Described 3rd module selects one or more path to be in the path calculated:
In the path calculated, according to path cost from small to large, the short path that the path minimum from expense or expense are time little, the path that can meet the bandwidth of the first numerical value is selected.
Described device comprises four module further, for when receive that arbitrary forwarding unit sends carry the Packet-in message of dynamic host configuration protocol DHCP request message time, DHCP request message is parsed from this message, for the transmission user equipment allocation IP address of this DHCP request message, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and returns to described transmission subscriber equipment;
And the first user equipment in the stream list item that described 3rd module issues and the second subscriber equipment are with IP address designation.
Described device comprises four module further, for when receive that arbitrary forwarding unit sends carry user equipment (UE) IP address report the Packet-in message of message time, from this message, parse this user equipment (UE) IP address report message, from this message, obtain the IP address of the local subscriber apparatus of this forwarding unit;
And the first user equipment in the stream list item that described 3rd module issues and the second subscriber equipment are with IP address designation.
Visible, the present invention can provide bandwidth safeguard to the responsible consumer equipment in SDN, improves the experience of user to SDN, avoids and occur that subscriber equipment repeats the network impairment connected in a large amount of flow attack situation.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of existing OpenFlow network;
Fig. 2 is the protocol massages structural representation of existing OpenFlow Controller when issuing stream table;
Bandwidth safeguard method flow diagram in the SDN that Fig. 3 provides for one embodiment of the invention;
The networking schematic diagram of the SDN that Fig. 4 provides for example of the present invention;
Bandwidth safeguard method flow diagram in the SDN that Fig. 5 provides for further embodiment of this invention;
The composition schematic diagram of the bandwidth safeguard device in the SDN that Fig. 6 provides for the embodiment of the present invention.
Embodiment
For clarity sake, first the following term occurred in the present invention is made an explanation:
The message that Packet-in:SDN forwarding unit is received is encapsulated in Packet-in message, and by SDN control link, Packet-in message is sent to SDN controller, and this message can indicate the inbound port of the message that forwarding unit receives.
Message is encapsulated in Packet-out message by Packet-out:SDN controller, and by SDN control link, Packet-out message is sent to SDN forwarding unit, and inform how SDN forwarding unit processes the message encapsulated in Packet-out message by this message.
Bandwidth safeguard method flow diagram in the SDN that Fig. 3 provides for one embodiment of the invention, its concrete steps are as follows:
Controller in step 301:SDN obtains the network topology structure of SDN.
The specific implementation process of this step can be as follows:
Step 011: when controller receive that arbitrary forwarding unit sends be packaged with the Packet-in message of the message that subscriber equipment sends time, which port of this forwarding unit of cicada must be connected to subscriber equipment.
By step 011, controller just can obtain the network topology structure in SDN between all forwarding units and its local subscriber apparatus.
Such as: when subscriber equipment is reached the standard grade, initiatively can send gratuitous ARP (the Address Resolution Protocol carrying own IP address, address resolution protocol) request message, after this message arrives the forwarding unit of subscriber equipment connection, this message can be encapsulated in Packet-in message by forwarding unit, encapsulate the ingress port information of this message on this forwarding unit in the message simultaneously, then controller is sent by this message, like this, from this Packet-in message, controller just can learn which port of this forwarding unit is connected to this subscriber equipment.
Step 012: controller obtains direct-connected network topology structure between two between forwarding unit, that is, learn direct-connected connectivity port between two between forwarding unit.
The specific implementation of this step is shown in step 021 ~ 024.
Below provide the detailed process that controller obtains direct-connected network topology structure between two between forwarding unit:
Step 021: controller outwards sends Packet-out message from all SDN protocol ports of self, the data of carrying in this message are for presetting message, and action is: broadcast to all of the port.
Default message and predefined message can be LLDP(Link Layer DiscoveryProtocol, Link Layer Discovery Protocol) message etc.,
Step 022: arbitrary forwarding unit receives described Packet-out message, parses default message from this message, the action according in this message: to all of the port broadcast, this default message is broadcasted away from all of the port of self.
Step 023: arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the inbound port of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
Here, controller can send out configuration flow list item up and down at each forwarding unit: receive default message, action: above send controller.Like this, after forwarding unit receives default message, just match with this stream list item, thus structure Packet-in message is by this default message up sending controller; Or, also can not issue configuration flow list item because: according to SDN agreement regulation, forwarding unit receive unknown message all will on send controller.
In actual applications, step 021 ~ 022 also can replace with: after arbitrary forwarding unit starts, and initiatively presets message to all of the port broadcast.
Step 024: when controller receives from the arbitrary SDN protocol port of self the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message.
Finally, controller can obtain direct-connected connectivity port between two between forwarding unit, namely obtains the network topology structure between forwarding unit.
For Fig. 4, if presetting message is LLDP message.Then: after DUT A receives from port D the LLDP message that DUTB sends, LLDP message is encapsulated in Packet-in message, port D is encapsulated in message simultaneously, after this Packet-in message arrives controller, controller parses LLDP message from message, learn that the sender of LLDP message is DUTB from the source MAC of LLDP message, learn that the sender of Packet-in message is DUT A from the source MAC of Packet-in message, the inbound port D of LLDP message on DUT A is parsed from Packet-in message, then finally can learn: the inbound port on DUT B to DUT A is D.
Because each DUT can broadcast LLDP message to neighbours DUT, so final controller can obtain direct-connected connectivity port between two between DUT, thus obtains the network topology structure of all forwarding units.
Controller in step 302:SDN, according to the network topology structure of the SDN obtained, obtains direct-connected link bandwidth between two between forwarding unit in SDN.
The specific implementation process of this step can be as follows:
Step 031: controller obtains the bandwidth of its each port to each forwarding unit in SDN.
Step 032: controller is according to the network topology structure of SDN, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
Controller in step 303:SDN according to obtain direct-connected link bandwidth between two between forwarding unit, for designated user equipment reserves link bandwidth.
The specific implementation process of this step can be as follows:
Step 041: controller confirms to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value.
Need the information of the bandwidth to the second subscriber equipment reserving the first numerical value for first user equipment, configuration can be waited on the controller by keeper, or by first user equipment directly to controller application.
Step 042: controller, according to the network topology structure of the SDN obtained, calculates all paths of first user equipment to the second subscriber equipment.
Step 043: controller selects one or more path in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path.
Wherein, when selecting paths, can in the path calculated, according to path cost from small to large, the path that the path minimum from expense or expense are time little, select the path that can meet the bandwidth of the first numerical value.
Step 044: controller, according to selected path, issues stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on this path.
Wherein, in stream list item, first user equipment and the second subscriber equipment can identify with IP address, and this IP address can be distributed by controller, also can by subscriber equipment active reporting to controller.
When by controller to user's distributing IP address time, controller is that the detailed process of the user equipment allocation IP address newly added can be as follows:
Step 050: enable DHCP(Dynamic Host ConfigurationProtocol on the controller in advance, DHCP).
Step 051: be preset in configuration flow list item on each forwarding unit in SDN: receive DHCP request message, action: above send controller.
Step 052: when a subscriber equipment adds SDN, send DHCP request message, the source MAC of this message is the MAC Address of self.
Step 053: after this DHCP request message arrives forwarding unit, the stream list item configured in this message and step 051 matches by forwarding unit, be then encapsulated in Packet-in message by this message, this message is mail to controller.
Step 054: controller receives this Packet-in message, DHCP request message is parsed from this message, for user equipment allocation IP address, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and sends to subscriber equipment through forwarding unit.
When initiatively IP address being reported controller by subscriber equipment, its detailed process can be as follows:
Step 061: be preset in configuration flow list item on each forwarding unit in SDN: receive IP address and report message, action: above send controller.
Step 062: after a subscriber equipment is from Dynamic Host Configuration Protocol server request to IP address, sends IP address to the forwarding unit self connected and reports message.
Step 063: after this IP address reports message to arrive forwarding unit, the stream list item configured in this message and step 061 matches by forwarding unit, be then encapsulated in Packet-in message by this message, this message is mail to controller.
Step 064: controller receives this Packet-in message, parses IP address and reports message from this message, obtains the IP address of subscriber equipment.
Bandwidth safeguard method flow diagram in the SDN that Fig. 5 provides for further embodiment of this invention, its concrete steps are as follows:
Step 500: enable DHCP on the controller in SDN.
Controller in step 501:SDN obtains the network topology structure of SDN.
Controller in step 502:SDN, according to the network topology structure of SDN, obtains direct-connected link bandwidth between two between forwarding unit in SDN.
Still for Fig. 4, if the direct-connected link bandwidth between two between forwarding unit of DUT A ~ D that controller obtains is as shown in table 1:
| Link | Bandwidth |
| DUT A－DUT B | 10G |
| DUT A－DUT C | 10G |
| DUT A－DUT D | 10G |
| DUT B－DUT C | 1G |
| DUT B－DUT D | 1G |
| DUT C－DUT D | 1G |
The direct-connected link bandwidth between two between forwarding unit of DUT A ~ D that table 1 controller obtains
Controller in step 503:SDN calculates direct-connected link overhead between two between forwarding unit.
For any two interconnective forwarding units, the link bandwidth between this two forwarding unit of the link overhead=1000M/ between this two forwarding unit.
Step 504: when needing the bandwidth of the first numerical value being left to the second subscriber equipment for first user equipment in advance, controller, according to the network topology structure of SDN and direct-connected link overhead between two between forwarding unit, adopts OSPF algorithm to calculate all paths of first user equipment to the second subscriber equipment.
Step 505: controller selects one in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path.
Still for Fig. 4, if PC A represents big customer, server A is critical server, and PC A have purchased the link bandwidth of the 500M of server A.Then controller needs for PC A is provided to the link guarantee of server A, and guarantee bandwidth is 500M.First controller adopts OSPF algorithm to calculate all paths of PC A to server A, and wherein: expense minimal path is DUT A-DUT C, expense time small path is DUT A-DUT B-DUT C; Then, controller on expense time small path DUT A-DUTB-DUT C for PC A reserves the bandwidth of 500M.
Wherein, the benefit of selection expense time small path bandwidth reserved is: because flow acquiescence walks expense minimal path, only when this path bandwidth is inadequate, just can select other path, therefore, select expense time small path to be PC A bandwidth reserved, the transmission of other flow can not be affected, the object of flow load sharing can be reached simultaneously, improve network bandwidth utilization factor.
Step 506: controller, according to the path at bandwidth reserved place, issues the stream list item from first user equipment to the second subscriber equipment to each forwarding unit on this path, and from the second subscriber equipment to the stream list item of first user equipment.
In this step, controller, after reserving bandwidth, also will adjust the available bandwidth in the path, bandwidth reserved place of self record, think that subsequent allocations bandwidth sum instructs traffic forwarding to provide foundation.
Still for Fig. 4, as mentioned above, if controller has reserved the bandwidth of the 500M of server A on the DUT A-DUT B-DUT C of path for PC A, if the IP address of each subscriber equipment is as shown in table 2:
| Subscriber equipment | Corresponding IP address |
| Server A | 192.168.10.101 |
| Server B | 192.168.10.102 |
| PC A | 192.168.20.101 |
| PC B | 192.168.20.102 |
The IP address of each subscriber equipment of table 2
Wherein, the IP address of subscriber equipment can be distributed by controller, or active reporting is to controller again to distribute rear subscriber equipment by Dynamic Host Configuration Protocol server, and specific implementation is shown in step 050 ~ 054, and 061 ~ 064.
The stream list item that then controller issues on DUT A ~ C is distinguished as follows:
One) for from server A to the flow of PC A:
The stream list item being issued to DUT A is as follows:
Object IP address is 192.168.20.101, and source IP address is 192.168.10.101, and outgoing interface is port D;
The stream list item being issued to DUT B is as follows:
Object IP address is 192.168.20.101, and source IP address is 192.168.10.101, and outgoing interface is port F;
The stream list item being issued to DUT C is as follows:
Object IP address is 192.168.20.101, and source IP address is 192.168.10.101, and outgoing interface is port B.
Two) for from PC A to the flow of server A:
The stream list item being issued to DUT C is as follows:
Object IP address is 192.168.10.101, and source IP address is 192.168.20.101, and outgoing interface is port H;
The stream list item being issued to DUT B is as follows:
Object IP address is 192.168.10.101, and source IP address is 192.168.20.101, and outgoing interface is port G;
The stream list item being issued to DUT A is as follows:
Object IP address is 192.168.10.101, and source IP address is 192.168.20.101, and outgoing interface is port A.
Meanwhile, the direct-connected link bandwidth between two between forwarding unit of DUT A ~ D is updated to shown in following table 3:
| Link | Bandwidth |
| DUT A－DUT B | 10G-0.5G=9.5G |
| DUT A－DUT C | 10G |
| DUT A－DUT D | 10G |
| DUT B－DUT C | 1G-0.5G=0.5G |
| DUT B－DUT D | 1G |
| DUT C－DUT D | 1G |
The direct-connected link bandwidth between two between forwarding unit of DUT A ~ D after table 3 controller upgrades
SDN in the embodiment of the present invention can be OpenFlow network.
The composition schematic diagram of the bandwidth safeguard device in the SDN that Fig. 6 provides for the embodiment of the present invention, this device is arranged on the controller of SDN, and this device mainly comprises: the first module, the second module and the 3rd module, wherein:
First module: the network topology structure obtaining SDN.
Second module: according to the network topology structure of the SDN that the first module obtains, obtain direct-connected link bandwidth between two between forwarding unit in SDN.
3rd module: according to direct-connected link bandwidth between two between forwarding unit in the SDN that the second module obtains, for link bandwidth reserved by important subscriber equipment.
Wherein, the network topology structure of the first module acquisition SDN can comprise:
According to the Packet-in message being packaged with the message that subscriber equipment sends that forwarding unit is sent, learn the network topology structure between forwarding unit and subscriber equipment; Obtain direct-connected network topology structure between two between forwarding unit.
First module obtains direct-connected network topology structure between two between forwarding unit and can comprise:
Outwards send Packet-out message from all SDN protocol ports of this controller, the data of carrying in this message are for presetting message, and action is: broadcast to all of the port, when the Packet-in message receiving arbitrary forwarding unit from arbitrary SDN protocol port of this controller and send, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message, wherein, arbitrary forwarding unit receives described Packet-out message, default message is parsed from this message, action according in this message: broadcast to all of the port, the all of the port of this message from self is broadcasted away, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, the SDN protocol port of this Packet-in message from self is sent,
Or comprise: receive from arbitrary SDN protocol port of this controller the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message, wherein, arbitrary forwarding unit presets message to all of the port broadcast of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, encapsulate this default message in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
Second module is according to described network topology structure, and obtaining direct-connected link bandwidth between two between forwarding unit can comprise:
The bandwidth of its each port is obtained to each forwarding unit in SDN, according to the network topology structure of SDN, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
3rd module is according to the direct-connected link bandwidth between two between forwarding unit obtained, and reserving link bandwidth for subscriber equipment can comprise:
Confirm to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value, then according to the network topology structure of the SDN obtained, calculate all paths of first user equipment to the second subscriber equipment, one or more path is selected in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path, and for selected path, issue stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on path.
3rd module selects one or more path can be in the path calculated:
In the path calculated, according to path cost from small to large, the short path that the path minimum from expense or expense are time little, the path that can meet the bandwidth of the first numerical value is selected.
Fig. 6 shown device can comprise four module further, for when receive that arbitrary forwarding unit sends carry the Packet-in message of DHCP request message time, DHCP request message is parsed from this message, for the transmission user equipment allocation IP address of this DHCP request message, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and returns to described transmission subscriber equipment;
And, the IP address designation that the first user equipment in the stream list item that the 3rd module issues and the second subscriber equipment distribute with four module.
Or, the Packet-in message that user equipment (UE) IP address reports message is carried for what receive that arbitrary forwarding unit sends, from this message, parse this user equipment (UE) IP address report message, from this message, obtain the IP address of the local subscriber apparatus of this forwarding unit;
And, the IP address designation that the first user equipment in the stream list item that the 3rd module issues and the second subscriber equipment obtain with four module.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (16)
1. the bandwidth safeguard method in software defined network SDN, it is characterized in that, the method comprises:
Controller in SDN obtains the network topology structure of SDN;
Described controller, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit in SDN;
Described controller according to obtain direct-connected link bandwidth between two between forwarding unit, for link bandwidth reserved by subscriber equipment.
2. method according to claim 1, is characterized in that, the network topology structure that the controller in described SDN obtains SDN comprises:
The Packet-in message being packaged with the message that local subscriber apparatus sends that controller is sent according to forwarding unit, learns the network topology structure between forwarding unit and local subscriber apparatus;
Controller outwards sends Packet-out message from all SDN protocol ports of self, and the data of carrying in this message are for presetting message, and action is: broadcast to all of the port, when controller receives from the arbitrary SDN protocol port of self the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit receives described Packet-out message, default message is parsed from this message, action according in this message: broadcast to all of the port, this default message is broadcasted away from all of the port of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, the SDN protocol port of this Packet-in message from self is sent.
3. method according to claim 1, is characterized in that, the network topology structure that the controller in described SDN obtains SDN comprises:
The Packet-in message being packaged with the message that local subscriber apparatus sends that controller is sent according to forwarding unit, learns the network topology structure between forwarding unit and local subscriber apparatus;
Controller receives from the arbitrary SDN protocol port of self the Packet-in message that arbitrary forwarding unit sends, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit presets message to all of the port broadcast of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, encapsulate this default message in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
4. method according to claim 1, is characterized in that, described controller, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit and comprises:
Described controller obtains the bandwidth of its each port to each forwarding unit in SDN, according to described network topology structure, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
5. method according to claim 1, is characterized in that, described controller, according to the direct-connected link bandwidth between two between forwarding unit obtained, is reserved link bandwidth for subscriber equipment and comprised:
Controller confirms to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value, then according to the network topology structure of the SDN obtained, calculate all paths of first user equipment to the second subscriber equipment, one or more path is selected in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path, and for selected path, issue stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on path.
6. method according to claim 5, is characterized in that, described one or more path of selecting in the path calculated is:
In the path calculated, according to path cost from small to large, the short path that the path minimum from expense or expense are time little, the path that can meet the bandwidth of the first numerical value is selected.
7. method according to claim 5, is characterized in that, described method comprises further:
When controller receive that arbitrary forwarding unit sends carry the Packet-in message of dynamic host configuration protocol DHCP request message time, DHCP request message is parsed from this message, for the transmission user equipment allocation IP address of this DHCP request message, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and returns to described transmission subscriber equipment;
And the first user equipment in described stream list item and the second subscriber equipment are with IP address designation.
8. method according to claim 5, is characterized in that, described method comprises further:
What controller received that arbitrary forwarding unit sends carries the Packet-in message that user equipment (UE) IP address reports message, parses this user equipment (UE) IP address and reports message, obtain the IP address of the local subscriber apparatus of this forwarding unit from this message from this message;
And the first user equipment in described stream list item and the second subscriber equipment are with IP address designation.
9. the bandwidth safeguard device in software defined network SDN, this device is arranged on the controller of SDN, it is characterized in that, this device comprises:
First module: the network topology structure obtaining SDN;
Second module: according to the network topology structure of SDN, obtains direct-connected link bandwidth between two between forwarding unit in SDN;
3rd module: according to the link bandwidth between two between forwarding unit direct-connected in SDN, for link bandwidth reserved by important subscriber equipment.
10. device according to claim 9, is characterized in that, the network topology structure that described first module obtains SDN comprises:
According to the Packet-in message being packaged with the message that subscriber equipment sends that forwarding unit is sent, learn the network topology structure between forwarding unit and subscriber equipment;
Outwards send Packet-out message from all SDN protocol ports of this controller, the data of carrying in this message are for presetting message, and action is: broadcast to all of the port, when receiving the Packet-in message that arbitrary forwarding unit is sent from arbitrary SDN protocol port of this controller, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit receives described Packet-out message, from this message, parse default message, the action according in this message: to all of the port broadcast, broadcasted away by all of the port of this message from self; Arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, this default message is encapsulated in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
11. devices according to claim 9, is characterized in that, the network topology structure that described first module obtains SDN comprises:
According to the Packet-in message being packaged with the message that subscriber equipment sends that forwarding unit is sent, learn the network topology structure between forwarding unit and subscriber equipment;
The Packet-in message that arbitrary forwarding unit sends is received from arbitrary SDN protocol port of this controller, default message is parsed from this message, the MAC Address of the transmission forwarding unit of this default message is learnt from the source MAC of this default message, the MAC Address of the transmission forwarding unit of Packet-in message is learnt from the source MAC of this message, simultaneously, the inbound port of this default message on the transmission forwarding unit of Packet-in message is parsed from this message, thus obtain: preset the transmission forwarding unit of message to the inbound port on the transmission forwarding unit of Packet-in message,
Wherein, arbitrary forwarding unit presets message to all of the port broadcast of self, arbitrary forwarding unit receives default message from the arbitrary port of self, construct described Packet-in message, encapsulate this default message in message, carry the ingress port information of this default message on this forwarding unit simultaneously, the source MAC of message is the MAC Address of this forwarding unit, target MAC (Media Access Control) address is the MAC Address of controller, is sent by the SDN protocol port of this Packet-in message from self.
12. devices according to claim 9, is characterized in that, described second module, according to described network topology structure, obtains direct-connected link bandwidth between two between forwarding unit and comprises:
The bandwidth of its each port is obtained to each forwarding unit in SDN, according to the network topology structure of SDN, learn direct-connected connectivity port between two between forwarding unit, for any two interconnective ports, if the bandwidth for this two-port that this two-port place forwarding unit reports is consistent, then direct using this bandwidth as the link bandwidth between this two forwarding unit; Otherwise, using bandwidth smaller as the link bandwidth between this two forwarding unit.
13. devices according to claim 9, is characterized in that, described 3rd module, according to the direct-connected link bandwidth between two between forwarding unit obtained, is reserved link bandwidth for subscriber equipment and comprised:
Confirm to need for first user equipment reserves the bandwidth to the second subscriber equipment of the first numerical value, then according to the network topology structure of the SDN obtained, calculate all paths of first user equipment to the second subscriber equipment, one or more path is selected in the path calculated, for first user equipment reserves the bandwidth of the first numerical value on selected path, and for selected path, issue stream list item from first user equipment to the second subscriber equipment and from the second subscriber equipment to the stream list item of first user equipment to each forwarding unit on path.
14. devices according to claim 13, is characterized in that, described 3rd module selects one or more path to be in the path calculated:
In the path calculated, according to path cost from small to large, the short path that the path minimum from expense or expense are time little, the path that can meet the bandwidth of the first numerical value is selected.
15. devices according to claim 13, it is characterized in that, described device comprises four module further, for when receive that arbitrary forwarding unit sends carry the Packet-in message of dynamic host configuration protocol DHCP request message time, DHCP request message is parsed from this message, for the transmission user equipment allocation IP address of this DHCP request message, this IP address is carried in dhcp response message, this dhcp response message is encapsulated in Packet-out message and returns to described transmission subscriber equipment;
And the first user equipment in the stream list item that described 3rd module issues and the second subscriber equipment are with IP address designation.
16. devices according to claim 13, it is characterized in that, described device comprises four module further, for when receive that arbitrary forwarding unit sends carry user equipment (UE) IP address report the Packet-in message of message time, from this message, parse this user equipment (UE) IP address report message, from this message, obtain the IP address of the local subscriber apparatus of this forwarding unit;
And the first user equipment in the stream list item that described 3rd module issues and the second subscriber equipment are with IP address designation.
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| CN201410134517.XA CN104980368A (en) | 2014-04-03 | 2014-04-03 | Bandwidth guarantee method and apparatus in software defined network (SDN) |
| PCT/CN2015/075452 WO2015149676A1 (en) | 2014-04-03 | 2015-03-31 | Reserving bandwidth in software defined network |
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| CN201410134517.XA CN104980368A (en) | 2014-04-03 | 2014-04-03 | Bandwidth guarantee method and apparatus in software defined network (SDN) |
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| CN107277190A (en) * | 2017-07-14 | 2017-10-20 | 中国联合网络通信集团有限公司 | A kind of method of SDN equipment automatic wire charging, SDN equipment and controller |
| CN107645556A (en) * | 2017-09-26 | 2018-01-30 | 中国联合网络通信有限公司广东省分公司 | A kind of method and its forwarding and control device realized SDN and turn the broadband user's access and keep-alive of control separation |
| CN107682191A (en) * | 2017-09-30 | 2018-02-09 | 中国电力科学研究院 | A kind of power scheduling network information centralized management method and system |
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| US10003519B2 (en) * | 2015-11-13 | 2018-06-19 | Nanning Fugui Precision Industrial Co., Ltd. | Data delivery method based on software defined networking and software defined networking controller using the method |
| CN105491178B (en) * | 2015-11-23 | 2018-10-09 | 北京邮电大学 | A kind of host network card IP address acquisition methods based on software defined network |
| CN105763463B (en) * | 2016-01-27 | 2020-01-03 | 新华三技术有限公司 | Method and device for transmitting link detection message |
| CN107786351B (en) * | 2016-08-24 | 2021-02-12 | 中国电信股份有限公司 | Service bandwidth self-adaptive adjusting method and system and SDN controller |
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| CN100438503C (en) * | 2005-10-26 | 2008-11-26 | 华为技术有限公司 | Path selecting method |
| CN100442779C (en) * | 2006-02-10 | 2008-12-10 | 华为技术有限公司 | Control system and data message transmission method in Ethernet |
| CN100596102C (en) * | 2006-09-29 | 2010-03-24 | 中国电信股份有限公司 | Method for establishing label switched path of minimized path preemption cost |
| CN102904809B (en) * | 2011-07-26 | 2016-08-03 | 华为技术有限公司 | The bandwidth management methods, devices and systems of label forwarding path |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107277190A (en) * | 2017-07-14 | 2017-10-20 | 中国联合网络通信集团有限公司 | A kind of method of SDN equipment automatic wire charging, SDN equipment and controller |
| CN107277190B (en) * | 2017-07-14 | 2019-09-20 | 中国联合网络通信集团有限公司 | A kind of method of SDN equipment automatic wire charging, SDN equipment and controller |
| CN107645556A (en) * | 2017-09-26 | 2018-01-30 | 中国联合网络通信有限公司广东省分公司 | A kind of method and its forwarding and control device realized SDN and turn the broadband user's access and keep-alive of control separation |
| CN107645556B (en) * | 2017-09-26 | 2018-12-07 | 中国联合网络通信有限公司广东省分公司 | It is a kind of to realize that SDN turns the isolated broadband access of control and keepalive method and device |
| CN107682191A (en) * | 2017-09-30 | 2018-02-09 | 中国电力科学研究院 | A kind of power scheduling network information centralized management method and system |
| CN107682191B (en) * | 2017-09-30 | 2021-10-29 | 中国电力科学研究院 | Power dispatching network information centralized management and control method and system |
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